回复如下，没说到哪一步...
U.S. Citizenship and Immigration Services (USCIS) records show that the
priority date of the case for which your constituent is inquiring is
currently available and that USCIS is processing the case. Your constituent
may check the status of his case by entering his receipt number in the Case
Status box found at Check My Case Status or by calling the National
Customer Service Center at (800) 375-5283. Your constituent may also
register online for automatic updates by clicking on Sign-up for Case
Updates.
If after 60 days from the date of this email USCIS has not notified your
constituent regarding the status of this case, please feel free to contact
our office to request the status.
